Chlorine inactivation of mixed population versus indicator microorganism (poster)

Chlorine is present in most swimming pools as residual disinfectant. In the Netherlands, the chlorine concentration in swimming pools has to be between 0.5-1.5 mg/L free available chlorine, which is based on a 4-log removal of Pseudomonas aeruginosa within 30 seconds. Besides disinfection of microorganisms side reactions form disinfection by-products (DBPs), which are irritating and can be harmful to swimmers health. One way to lower the formation of DBPs is by lowering the chlorine concentration to a minimum level, where disinfection is still sufficient